Brawnerium-66 which has a half-life of 14.5 minutes. If I start with a 280 gram, how much time will have passed when only 35 grams is remaining of 280?

When the following equation is balanced using the smallest possible integers, what is the coefficent of oxygen gas? c7h16o(g) + o2(g) → co2(g) + h2o(g) -1 -5 -8 -16 -21

The alkali metals (group 1) consist of lithium (3), sodium (11), potassium (19), rubidium (37), cesium (55), and francium (87). they are soft, metallic solids with low densities and low melting points. based on the data shown in figure 1, how many valence electrons do alkali metals share?

According to the vsepr theory what is the shape of a molecule that has a central atom valence three other items with no lone pairs of electrons